LSL(2) (Thumb*) - Logical Shift Left
Syntax
LSL dest, source
where:
|
dest |
Register containing the operand and destination register |
|
source |
Register containing the shift |
Description
The LSL instruction in this format shifts left, the bits of dest by the number specified in source and stores the result in dest . The result represents the value of a register multiplied by a variable power of 2.Addressing Mode
No operands.Flags Affected
|
N |
Z |
C |
V |
Q |
S |
I |
F |
T |
|
M |
M |
M |
|
|
|
|
|
|
|
15 |
14 |
13 |
12 |
11 |
10 |
9 |
8 |
7 |
6 |
5 |
|
3 |
2 |
|
0 |
|
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
source |
dest |
||||
Example
1 ;@.text
2 ;@.globl funlsl
3 ;@.align 0
4 ;
5 AREA example,CODE,READONLY
6 CODE16
7
8 label1
9 ; Logical shift left value in R3
10 ; 12 times. The 12 is put in R2
11 ; Put result back to R3
12 00000000 F7C2 MOV R2, #OxC
13 00000002 4093 LSL R3, R2
Further Information
See ASR(1) InstructionSee ASR(2) Instruction
See LSL(1) Instruction
See LSR(1) Instruction
See LSR(2) Instruction
See ROR Instruction